| Summary: | Carbamazepine (CBZ), as a typical pharmaceutical and personal care product (PPCP), cannot be efficiently removed by the conventional drinking water and wastewater treatment process. In this work, the CoS<sub>2</sub>/Fe<sup>2+</sup>/PMS process was applied for efficient elimination of CBZ. The CBZ removal efficiency of CoS<sub>2</sub>/Fe<sup>2+</sup>/PMS was 2.5 times and 23 times higher than that of CoS<sub>2</sub>/PMS and Fe<sup>2+</sup>/PMS, respectively. The intensity of DMPO-HO• and DMPO-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mrow><mo>•</mo><mo>−</mo></mrow></mrow></msubsup></mrow></semantics></math></inline-formula> followed the order of Fe<sup>2+</sup>/PMS < CoS<sub>2</sub>/PMS < CoS<sub>2</sub>/Fe<sup>2+</sup>/PMS, also suggesting the CoS<sub>2</sub>/Fe<sup>2+</sup>/PMS process has the highest oxidation activity. The effects of reaction conditions (e.g., CoS<sub>2</sub> dosage, Fe<sup>2+</sup> concentration, PMS concentration, initial CBZ concentration, pH, temperature) and water quality parameters (e.g., <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>SO</mi></mrow><mn>4</mn><mrow><mrow><mn>2</mn><mo>−</mo></mrow></mrow></msubsup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><msubsup><mrow><mi>PO</mi></mrow><mn>4</mn><mo>−</mo></msubsup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>Cl</mi></mrow><mo>−</mo></msup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></mrow></semantics></math></inline-formula>, humic acid) on the degradation of CBZ were also studied. Response surface methodology analysis was carried out to obtain the best conditions for the removal of CBZ, which are: Fe<sup>2+</sup> = 70 µmol/L, PMS = 240 µmol/L, CoS<sub>2</sub> = 0.59 g/L. The sustainability test demonstrated that the repeated use of CoS<sub>2</sub> for 8 successive cycles resulted in little function decrease (<10%). These findings suggest that CoS<sub>2</sub>/Fe<sup>2+</sup>/PMS may be a promising method for advanced treatment of tailwater from sewage treatment plant.
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